Ohm's Law Calculator for Voltage, Current, Resistance, and Power

Ohm’s Law is a basic fundamental rule in electrical engineering and physics that explains the relationship between voltage, current, and resistance in a circuit.

It states that the current flowing through a conductor depends on the voltage applied across it and the resistance in the path. A higher voltage increases the current, while greater resistance reduces it.

Ohm's Law Calculator

Voltage (V)

Current (I)

Resistance (R)

Power (P)

Voltage (V)

Current (I)

Resistance (R)

Power (P)

Calculation Steps

Enter any two values above to see calculation steps here.

Ohm’s Law Calculator for Voltage, Current, Resistance, and Power

Ohm’s Law explains the relationship between current (I), voltage (V), and resistance (R) in an electrical circuit:

I = V / R

This means the current flowing through a conductor is directly proportional to the applied voltage and inversely proportional to the resistance.

Example

If we double the voltage (e.g., by stacking two batteries in series), the current will also double.

Three Forms of Ohm’s Law

Depending on what you need to find, you can rearrange the formula:

I = V / R

V = I × R

R = V / I

Ohm’s Law is important for designing electronic circuits, such as voltage dividers and resistive sensors, commonly used in microcontroller projects.

Understanding Ohm’s Law

After years of research, German physicist Georg Simon Ohm published “Galvanic Circuit Investigated Mathematically” in 1827, which became the foundation of Ohm’s Law.